also in that interview, new details about the questioning of jahar tsarnaev, and concerns that a big mistake may have been made. stand by for this important interview. plus, a gathering of five american presidents. you're going to see who got emotional, who got laughs at the opening of president george w. bush's library. i'm wolf blitzer. we want to welcome our viewers in the united states and around the world. the world. you're in "the situation room." -- captions by vitac -- www.vitac.com >>> the terrifying scenario, imagine if the marathon bombing suspects had gotten out of the boston area after the attack and headed straight to times square in new york with bombs ready to blow. new york city officials now confirming that jahar tsarnaev has told investigators what he and his brother had planned. let's go to times square right now. mary snow is standing by with the very latest. mary? >> well, wolf, new york city's mayor and the city's police commissioner say the fbi told them there was talk of tar getting times square. but few details were offered. in the chaos of last week's manhu